The Journal of General Physiology
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The Journal of General Physiology, Vol 16, 677-684, Copyright © 1933 by The Rockefeller University Press

ARTICLE

STIMULATION BY THE MINERAL ACIDS, HYDROCHLORIC, SULFURIC, AND NITRIC, IN THE SUNFISH EUPOMOTIS

William H. Cole 1 and J. B. Allison 1

1 From the Department of Physiology and Biochemistry, Rutgers University, New Brunswick

1. The stimulating efficiency of hydrochloric, sulfuric, and nitric acids has been measured in the sunfish Eupomotis gibbosus, by a method which reduces experimental errors to a minimum.

2. The results show that stimulation by these acids is primarily dependent upon the (H+) produced in the animal's aquatic environment, and that the reaction time is a logarithmic function of the (H+) within the range tested expressed by the equation: (RT–5) = –4.3 log (H+ x 104) + 9.118.

3. Any effect of the chloride, sulfate, and nitrate ions must itself be measured by the (H+).

4. Variation in the reaction time is also a logarithmic function of the (H+), and the percentage variation is independent of the (H+) over the range tested.

5. Freshly collected fish show a lower threshold for stimulation as determined by the (H+) than do fish adapted to laboratory conditions, but relatively the reaction times of the two groups are the same.

Accepted on October 17, 1932


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